Sydney matched its September maximum temperature record of 34.6 degrees Celsius (94.3 degrees Fahrenheit ) on Tuesday. The Australian Bureau of Meteorology described it as an unusually warm start to spring for much Australia's southeast.
"We are in this run of very, very warm weather which hasn't been seen in many, many years," the bureau's senior meteorologist Miriam Bradbury said.
Authorities said 61 wildfires were burning across Australia's most populous state Tuesday, with 13 burning out of control.
Authorities declared a "catastrophic" fire danger along the south coast of New South Wales, the highest level of danger in a five-tier rating system.
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